add messageable_type to returned messages columns

Author: Saifallak

src/Models/Conversation.php

@@ -330,6 +330,7 @@ private function getConversationMessages(Model $participant, $paginationParams,
                     $this->tablePrefix.'message_notifications.updated_at as read_at',
                     $this->tablePrefix.'message_notifications.deleted_at as deleted_at',
                     $this->tablePrefix.'message_notifications.messageable_id',
+                    $this->tablePrefix.'message_notifications.messageable_type',
                     $this->tablePrefix.'message_notifications.id as notification_id',
                     $this->tablePrefix.'message_notifications.is_seen',
                     $this->tablePrefix.'message_notifications.is_sender',